Description
Product size (without terminal): length 88mm*width 37mm*height 59mm
Industrial-grade passive RS232 to RS485 rail installation, serial self-powered, adaptive baud rate, industry standard design, high-grade protection; rail mounting.
First, product introduction
Our 232/485 CONVERTER is a bidirectional interface converter between RS232 and RS485. It is used between the main control unit, the main control unit and the MCU peripherals to form a point-to-point and point-to-multipoint remote multi-machine communication network. Achieve multi-machine response communication, widely used in industrial automation control systems, card, access control system, parking system, self-service banking system, bus toll system, canteen selling system, company employee attendance management system, highway toll station system, etc. Wait.
Our 232/485 CONVERTER can convert the TXD and RXD signals of the RS232 serial port into a two-wire balanced half-duplex RS485 signal. No external power supply is required, and the signal pin can be directly smuggled from the RS232 port. The hardware and installation are very simple.
Second, the performance parameters
1. Serial port characteristics: The serial port is compatible with EIA/TIA RS232C and RS485 standards;
2. Working mode: asynchronous half-duplex;
3. Transmission medium: ordinary line, twisted pair or shielded line;
4, transmission rate: 300-115200bps;
5, transmission distance: 5m (RS232 end) 1200m (RS485 end);
6, communication protocol: transparent;
7, working environment: -20 ° C to 70 ° C relative humidity of 5% to 95%;
8, signal: RS232----TXD, RXD, GND;
RS485----Data+, Data-;
Third, the wiring method
1. The devices GND, RX, and TX are respectively connected to GND, TX, and RX of the RS232 terminal, that is, the device GND is connected to the RS232 terminal GND, the device TX is connected to the RS232 terminal RX, and the device RX is connected to the RS232 terminal TX.
2. The devices D+ and D- are connected to the RS485 terminals A+ and B- respectively.
The connection diagram is as follows:
Fourth, failure analysis
1. Data communication is unsuccessful:
A. Check if the RS232 interface is connected correctly.
B. Check if the RS485 interface is connected correctly.
C. Detect whether the signal level difference of the RS232 interface is lower than 5V;
2, data loss or garbled:
A. Detect whether the data rate and format of the two segments of the data communication device are consistent;
B, can add matching resistor 1/4W 120Ω.
